CEPHALOPODA. 16/5 



Arms longer than the body ; the two dorsal pairs the longest, 

 and webbed half-way up, and sometimes to the extremities. 

 Arms not webbed in male. 4 aquiferous (?) openings, two be- 

 tween the eyes, and two below ; sometimes there are small 

 openings on the sides ; suckers in two rows ; third right arm 

 hectocotylised. 



Distribution, 3 species. T. quoyanus, violaceus, and velifer. 

 Atlantic and Mediterranean. 



PiisnsrocTOPiTs, D'Orb. Finned octopus. 



Body with lateral fins, united behind. 



The only known species, P. cordiformis, was discovered by 

 MM. Quoy and Gaimard, on the coast of New Zealand; it 

 exceeds 3 feet in length 



Eledone. (Aristotle.) Leach. 



Type, E. octopodia, L. 



Suckers forming a single series on each arm ; length 6 to 18 

 inches. E. Moschata emits a musky smell. Third right arm 

 hectocotylised ; permanently attached ; developed free. 



Distribution, 2 species. Coasts of Norway, Britain, and the 

 Mediterranean. 



CiRHOTEUTnis. Eschricht. 1836. 



Synonyms^ Sciadephorus (Eeinh and Prosch) ; Bostrycho- 

 teuthis (Ag.) 



Etymology, cirrus, a filament, and teuthis, a cuttle-fish. 



Body with two transverse fins ; arms united by a web, nearly 

 to their tips ; suckers in a single row, alternating with cirri. 

 Length 10 inches. Colour violet. The only species ((7. Miillerij 

 Esch.) inhabits the coast of Greenland. 



Philonexis, D'Orb. 



Etymology, pliilos, an adept in nexis, swimming. 



Type, P. atlanticus, D'Orb. 



Arms free ; suckers in two rows ; mantle supported by two 

 ridges on the funnel ; eyes large and prominent. Total length, 

 1 to 3 inches. 



Distribution, 6 species. Atlantic and Mediterranean. Gre- 

 garious in the open sea ; feeding on floating mollusca. 



Sc^TJKGTJS. Troschel. 1857. 

 Body oval, without fins ; wider than the head ; ann& ghort ; 



